The World Car Free network www.worldcarfree.net is urging people around the world take the heat off the planet by giving up their cars for one day. International Car Free Day is September 22, and the organization, which promotes green transportation alternatives, is hoping that one day can turn into a week, then a month, and, eventually, a smaller carbon footprint for everyone.

According to the Environmental Defense Fund www.edf.org, the U.S. has 30 percent of the world’s cars but emits 45 percent of the world’s global automotive CO2 emissions; an estimated 450 million tons are emitted by personal vehicles alone.

So, on the 22nd, give your car the day off. Hop a subway or ride a bike. The planet will be grateful.